CVE-2026-73395

Deferred Deferred - Pending Action

Unauthenticated IDOR in Booking Calendar <= 3.2.36

Publication date: 2026-08-18

Last updated on: 2026-08-20

Assigner: Patchstack

Description

Unauthenticated Insecure Direct Object References (IDOR) in Booking calendar, Appointment Booking System <= 3.2.36 versions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-18

Last Modified

2026-08-20

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-73395

EUVD

EUVD-2026-60801

Affected Vendors & Products

Vendor	Product	Version / Range
booking_calendar	appointment_booking_system	to 3.2.36 (inc)
booking_calendar	booking_calendar	to 3.2.36 (inc)
appointment_booking_system	appointment_booking_system	to 3.2.36 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

This is an Insecure Direct Object References (IDOR) vulnerability in the WordPress Booking calendar, Appointment Booking System Plugin versions 3.2.36 and below. It allows unauthenticated attackers to bypass authorization and access sensitive files, folders, or database interactions due to broken access control.

Detection Guidance

To detect this IDOR vulnerability, inspect the WordPress plugin 'Booking calendar, Appointment Booking System' for versions 3.2.36 or below. Check for unauthorized access to sensitive files or database interactions without proper authentication.

Impact Analysis

The vulnerability poses a risk of unauthorized access to sensitive data or system functions. Attackers could exploit it to view, modify, or delete restricted information without authentication. With a CVSS score of 6.5, it is considered moderately dangerous and could be targeted in mass exploitation campaigns.

Compliance Impact

This IDOR vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy). Unauthorized access risks exposing personal or protected health information, potentially resulting in legal penalties or breaches of regulatory standards.

Mitigation Strategies

Immediately update the Booking calendar, Appointment Booking System Plugin to the latest version if available. If no patch exists, contact your hosting provider or developer for assistance. Disable the plugin temporarily if updates are not possible.

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